* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	font: bold 14px Arial, sans-serif;
	transition: all 0.2s ease;
}

.calculator {
	width: 500px;
	height: auto;
	
	margin: 100px auto;
	padding: 20px 20px 9px;
	
	background: #9dd2ea;
	background: linear-gradient(#9dd2ea, #8bceef);
	border-radius: 10px;
	box-shadow: 0px 4px #009de4;
}

input {
	width: 75%;
	border: 1px gray solid;
	padding-right : 10px;
	height: 40px;
	float: left;
	position: relative;
	left: 2px;
	border: none;
	text-align: right;
}

button {
	width: 100%;
	height: 40px;
	background: white;
	border-radius: 1px;
	border: none;
}

button:hover {
	background: #ddd;
	cursor: pointer;
	box-shadow: 0px 1px #aaa;
}

.operation {
	background: #FFF0F5;
}

.clear {
	width: 24.5%;
	float:left;
	height: 40px;

	position: relative;
}